Patch 4.2 - PTR Build 14107
A new build is being deployed on test realms.

Update02:00AM CET - The proc for Dragonwrath, Tarecgosa's Rest might be added in this build. As usual, nothing official for the moment but it's very consistent with the official preview.

Originally Posted by MMO-Champion

Wrath of Tarecgosa - When you deal damage, you have a chance to gain the Wrath of Tarecgosa, duplicating the harmful spell.

Originally Posted by Blizzard
(Blue Tracker)

The great staff duplicates destructive magics, and also bestows upon its wielder the ability to transform into a member of the Blue Dragonflight.

Official Patch Notes
If anything below isn't in the official notes, it's not confirmed and potentially false.

Originally Posted by Blizzard
(Blue Tracker)

General

All existing Valor Points in the Currency tab have been converted to Justice Points.

Achievements

Bear-ly Made It (new achievement): Save all four prisoners before they are sacrificed in Zul'Aman on Heroic difficulty.

Classes: General

Players are once again free to dance in combat (without causing graphic errors). Other animations, such as attacks, will take precedence over dancing. The dance animation will be suppressed until the higher priority animation is complete. Fun has been unnerfed.

Denounce has been redesigned. It still reduces the mana cost of Exorcism. However, it no longer has a chance on Holy Shock of making Exorcism free and instant. Instead, it has a 50/100% chance to prevent the Exorcism target from causing critical effects for the next 6 seconds. This effect can be dispelled.

Holy Shock mana cost has been decreased to 7% of base mana, down from 8%.

Protection

Holy Shield now increases block chance by 5% while active, instead of increasing the amount of damage blocked by 10%.

Retribution

Selfless Healer can no longer be dispelled and cannot be stolen via Spellsteal; and, in addition to its current effects, it lowers the cooldown of Word of Glory by 5/10 seconds.

Vanessa VanCleef (Heroic difficulty) now has a sweet, sweet voice to accompany her dialog.

ItemsSet Bonuses

The 2-piece resilience bonus from Cataclysm PvP sets no longer stacks. If a player wears 2 pieces each from 2 different Cataclysm sets, the player will only receive the 400 resilience rating bonus once. This change does not apply to PvP sets from prior expansions.

ProfessionsJewelcrafting

The shield block value bonus from Eternal Earthsiege Diamond has been increased to 3%, up from 1%.

Armor Sets - Druid Tier 12
The gloves still look a little weird and the light effects might be a little off (color-wise) but it should be ok now.

Ferocious Bite now costs 25 Energy, down from 35. Now consumes up to 25 additional energy, down from 35. Base damage increased by 12%, from [380 + 54.5% of AP]-[615 + 54.5% of AP] to [410 + 54.5% of AP]-[680 + 54.5% of AP] at 5 Combo Points. (Check tooltip for less combo points)

Frenzied Regeneration now increases health by 15%, down from 30%. Increases health to 15%, down from 30%.

Harmony (Mastery) has been revamped - Your direct healing is increased by an additional 10% and casting your direct healing spells grants you an additional 10% bonus to periodic healing for 10 sec. Each point of Mastery increases each bonus by an additional 1.25%.

Balance

Earth and Moon now also affects Wild Mushroom: Detonate and lasts 15 sec, up from 12 sec.

Improved Water Shield is now Resurgence While Water Shield is active, you recover mana when your direct healing spells have a critical effect. You regain 2292 mana from a Healing Wave or Greater Healing Wave critical, 1375 mana from a Healing Surge, Riptide, or Unleash Life critical, and 763 mana from a Chain Heal critical.

Also, after this build the Leyara quest better f**king be fixed on the ptr. I'd like to actually be able to go to the molten front and try out some of these achievements, instead of standing in line for 45 minutes only to have her despawn after 3 seconds of the quest event.